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7+6×(×÷4-18) am nevoie urgent

Răspuns :

7+6×(X:4-18) = 25
6×(X:4-18) = 25-7
6×(X:4-18) = 18
X:4-18 = 18:6
X:4-18 = 3
X:4 = 3+18
X:4 = 21
X= 21×4
X = 84